本文關(guān)鍵詞：外源鐵輸入下曝氣對(duì)小興凱湖狹葉甜茅濕地碳、磷元素的影響　出處：《中國科學(xué)院大學(xué)(中國科學(xué)院東北地理與農(nóng)業(yè)生態(tài)研究所)》2017年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 狹葉甜茅 鐵磷比 人工曝氣 元素 小興凱湖

【摘要】：外源鐵輸入不僅影響濕地水體中磷去除,還影響濕地土壤元素形態(tài)轉(zhuǎn)化以及植物不同器官中元素的累積。本文旨在研究外源鐵輸入下曝氣對(duì)小興凱湖濕地狹葉甜茅濕地磷、碳元素的影響。為了清晰外源鐵輸入下曝氣對(duì)濕地元素的影響,本文通過室內(nèi)模擬實(shí)驗(yàn)和沉積芯培養(yǎng)實(shí)驗(yàn),研究不同鐵輸入強(qiáng)度和曝氣處理下,外界環(huán)境變化規(guī)律、水體中磷去除效果以及濕地元素在不同分室(水、土和植物)中的累積和分配特征。最后,本文還對(duì)比分析兩種不同培養(yǎng)方式下水體中磷去除率、濕地植物碳累積以及土壤鐵形態(tài)轉(zhuǎn)化,有助于深入理解濕地生態(tài)系統(tǒng)物質(zhì)循環(huán)過程,為濕地保護(hù)和恢復(fù)提供理論依據(jù)。主要結(jié)論如下:1、曝氣處理下,三種不同的鐵磷濃度比一定程度上可以降低水體磷濃度。在鐵磷比為5時(shí),水體中TP去除率隨著時(shí)間緩慢升高并趨于平穩(wěn);鐵磷比為6/10時(shí),水體中TP去除率呈大幅波動(dòng)式變化。2、外源鐵輸入影響到植物不同器官中元素累積濃度出現(xiàn)差異,其規(guī)律表現(xiàn)為Fe:根莖葉,P:莖葉根,TOC:莖葉根。狹葉甜茅對(duì)鐵耐受限度為10 mg/L。3、濕地土壤中有機(jī)磷和無機(jī)磷各占50%。其中,各形態(tài)無機(jī)磷比例差異較大,以鐵結(jié)合態(tài)磷為主,占無機(jī)磷的45%。小興凱湖具有很高的內(nèi)源磷負(fù)荷,與小興凱湖水體嚴(yán)重富營(yíng)養(yǎng)化和藻類爆發(fā)關(guān)系密切。4、鐵磷比為5時(shí),無定形鐵、鐵活度(無定形鐵/游離鐵)與有機(jī)碳存在顯著顯著的相關(guān)性(p0.05),而鐵磷比為10時(shí)鐵活度與有機(jī)碳并不存在相關(guān)性。因此,加大有機(jī)碳的投入即增加有機(jī)質(zhì)含量,有利于土壤無定形鐵含量增加,但并不一定會(huì)增強(qiáng)土壤氧化鐵活度。5、從濕地穩(wěn)定性出發(fā),為了維持小興凱湖狹葉甜茅的正常生長(zhǎng),應(yīng)當(dāng)控制水體中鐵濃度不超過10 mg/L,使鐵濃度控制在狹葉甜茅的耐受范圍之內(nèi)。并在狹葉甜茅耐受限度之內(nèi),投放小于等于5 mg/L鐵量,達(dá)到控制水體磷濃度的效果,從而凈化水質(zhì),恢復(fù)受污染的水體。
[Abstract]:Exogenous iron input not only affect the phosphorus removal of wetland water, also the cumulative effect of wetland soil and plant morphological transformation elements in different organs of elements. This paper aims to study the exogenous iron input under aeration on small Xingkai Lake Wetland glyceria spiculosa wetland phosphorus, carbon impact. In order to clear the exogenous input of iron under the influence of aeration on wetland elements in this paper, a laboratory experiment simulation and sedimentary core of different iron input intensity and aeration treatment, changes of the external environment, and the removal efficiency of wetland elements in different sub chamber of phosphorus in water (water, soil and plants) in the accumulation and distribution characteristics. Finally, this paper also analyzed two different training methods under the phosphorus removal rate of wetland plants and soil carbon accumulation in iron speciation, contribute to further understanding of wetland ecosystem material circulation process, provide the theory for wetland protection and restoration On the basis of. The main conclusions are as follows: 1, aeration treatment under three different concentration ratio of iron phosphorus decreased. The phosphorus concentration in the iron phosphate ratio is 5, the water removal rate of TP increased slowly with time and tends to be stable; iron phosphorus ratio was 6/10, the removal rate of TP was high in the water amplitude fluctuation change.2, exogenous iron input affect elements in different organs of plants accumulated concentration difference, the law is Fe: P: roots and leaves, stems and leaves of root, stem and leaf TOC: root. Glyceria spiculosa on iron tolerance limit is 10 mg/L.3, organic and inorganic phosphorus in the wetland soil in which accounted for 50%.. The proportion of different forms of inorganic phosphorus, mainly iron bound phosphorus, inorganic phosphorus accounted for 45%. small Xingkai Lake has internal phosphorus load is very high, and the small Xingkai Lake Eutrophication and algae outbreak is closely related to.4, iron and phosphorus ratio is 5, amorphous iron, amorphous iron (Fe activity free iron) There was significant correlation with organic carbon (P0.05), and iron phosphorus ratio is 10 and there is no correlation between organic carbon Fe activity. Therefore, increasing organic carbon input is conducive to increase the content of organic matter, soil amorphous iron content increased, but not necessarily enhance soil iron oxide activity.5, starting from the in order to maintain the stability of the wetland, the normal growth of small Xingkai Lake glyceria spiculosa, water should be iron concentration control does not exceed 10 mg/L, the concentration of iron within glyceria spiculosa. Within the range of tolerance and glyceria spiculosa tolerance, put on the iron content is less than or equal to 5 mg/L, to control the phosphorus concentration the effect to water purification and recovery of contaminated water.

【學(xué)位授予單位】：中國科學(xué)院大學(xué)(中國科學(xué)院東北地理與農(nóng)業(yè)生態(tài)研究所)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X524

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